The basic solar nebular disk model (SNDM), developed by Russian astronomer Victor Safronov, and was made available in English in the early 1970's. So your answer is B.<span />
Explanation: The prevailing model for planetary acceleration also known as the fractal assembly dating back to 18th century assumes that the solar system is made up of small grains striking each other chaotically into bigger ones, to form planetesimals.
Plastesimals then collide to form planets. This model was proposed by Russian astronomer Victor Safronov and it was further translated in English in 1970s by George Wetherill.
True. This is the case where an invasive species has reduced the genetic diversity of indigenous species.
Explanation:
An invasive species is an exotic, foreign species that takes over a specific habitat or ecosystem and destabilizes it.
Invasive species disrupt the food chains of an ecosystem which may lead to increase in populations of some species while reducing others.
Invasive species compete with indigenous species for food, shelter and mates. As the indigenous species cannot reproduce properly, a reduction in their genetic diversity is the direct result.
